Improvement in grain-binders



- 'ATITED STATES ROBERT H. MCCOBMICK, OF CHICAGO, ILLINOIS, ASSIGNOR TO C. H. AND

PATENT OFFICE.

L.l J.MCOBMICK, OF SAME PLACE.

IMPROVEMENTIN GRAIN-BINDERS.

Specification forming part of Letters Patent No. 173,130, dated February 8, 1876; application filed A I November 12, 1875.

- To all lwhom it may concern:

Be itknown that LRQBERT HALL MoCoR-` MICK, of Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Automatic Grain- Binders, of which the following is a specilication: y

My invention relates to automatic grainbinders of that class in which the twisting' wheel is intermittently actuated by a vibrating rack automatically thrown into and out of gear by movingthe slide in which the binding-head is mounted toward or from the rack The object of my invention is to hold the twister-wheel positively locked when out of gear. 'To this end my improvements consist in combining with a vibrating slide, which carries the twister-wheel, a fixed stop, against which the Wheel abuts When thrown out of gear with the rack, and is thus'eiectnally prevented from turning.

pinions and the stop, the face-plate of the binding-head being removed.'

The main features of the apparatus represented in the drawings are shown iii the application for Letters Patent of the .United States filed by Charles B. Withington, March 5, 1874.

The arm or frame A, upon Vwhich the mechanism is mounted, is, by preference, reciprocated by a continuously-traversing chain, as shown in that application. The sector-rack B is vibrated on its fulcrum b on the reciproeating frame A by a suitable pitman-connection.

The binding-head C is mounted in a bar, D, sliding longitudinally in the frame', and carrying a pin, d, working in an annular guideslot, e, in a bar, E, capable of sliding freely in the frame A, and alternately moved in opposite directions by abutting against the arms of a sector-rack, by'which means the twisterwheel c, mounted in the binding-head, is alternately thrown into and out of gear with the rack. f

The mechanism abovedeser'ibed so far is that shown in the Withington application their teeth in proper relation to each other v and to the slitin the binding-head, lfor the reception of the wire while the rack is out of gear. I therefore mountA upon the frame A a bent arm or'fixed stop, H, in such relation to the twister-pinions that when in gear with their actuating-rack tliey are free from the stop, but when thrown ont of gear the point ofthe stop enters the space between two of the teeth, and holds both twister-pinions locked. This stop, it will be seen, is strong and not liableto the breakage or to the wear and tear of a movable and spring stop, and has in practice been found very useful.

I disclaim the construction of the twister- A wheel in two sections, with an interposed plate, as shown in the drawings, that being the invention of William R. Baker, of Chicago, Illinois. Y

I claim as of my own invention- 1. The combination, substantially as here` inbefore set forth, of a reciprocating bindingframe, a vibrating sector-rack actuating the twister-pinions mounted on a sliding bar, D, and automatically thrown into and out of gear ywith the rack, and a IiXedstop secured to the frame A, against which the twist'er-pinions abut when thrown out of -gear with the rack, and by which they are positively locked, and prevented from turning until they are again thrown into gearv with the rack.

2. The fixed stop, rigidly attached to frame A, in combination with the slide-bar D and twister-pinions, substantially as set forth.

In testimony whereof I have hereunto subscribed my name.

ROBERT HALL MGCORMICK.

Witnesses:

J oH'N V. A. HAsBRooK, p

W. R. SELLEGK. 

